"SharkD" <nomail@nomail> schreef in bericht 
news:web.467c834435b0b28870b838070@news.povray.org...
> Differencing will be a problem due to the fact that the heightfield is a
> polygon-based object, and therefore has no inside. You'll be able to see
> through the hole to the underside of the heightfield.
>
>
No. You can difference a cube or whatever from a height_field. The 
differenced part will show as a negative image of the cube. See the attached 
image (quick-and-dirty) made in Moray.

Thomas

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